If it's an original, the top barrel flat should be marked "PATENTED SEPT. 14. 1858/ E. REMINGTON & SONS. ILION NEW YORK. U.S.A./ NEW-MODEL". The serial number is located on the bottom barrel flat and on the left side of the frame under the grip. Small single letter inspection marks are stamped on most components.
In the original percussion revolver competitions, the Remington New Army and Rogers & Spencer are the ones most commonly encountered. Various Colt revolvers can be seen as well, but most of the time the solid-frame revolvers win the medals. Powder charges are usually quite light. 15–20 grains of Swiss #2 is quite common, followed by some sort of grain filler, and a roundball which is topped by grease.